been driving my 2000 f-150 5.4l for a week now and it takes it a long time to blow any heat at all, i know its cold here right now, bot my old 95 f-150 6-cyl.got heat 10 times faster, any clues to why my new one doesnt want to build heat?

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f-150,xlt,ext.cab,2wd,5.4,3.55ls,trailer tow,capt.chairs,6-cd changer,power everything,sliding rear window,
mods.- hand made fresh air tube (k&n style), k&n filter,bug shield,more to come g-a-r-o-n-t-e-e-d

 

Maybe the thermostat is stuck opened or the radiator is low on fluid

 

checked coolant thats ok, thermostat could be stuck open, but how can you tell without changing anything?, truck has less than 900 miles on it, well maybee first service trip....

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f-150,xlt,ext.cab,2wd,5.4,3.55ls,trailer tow,capt.chairs,6-cd changer,power everything,sliding rear window,
mods.- hand made fresh air tube (k&n style), k&n filter,bug shield,more to come g-a-r-o-n-t-e-e-d

 

I think one symptom of the thermostat being stuck open would be the truck not reaching normal operating temperature.

Does the valve allowing water to enter the heater core open fully?

Any kinked heater hoses?

 

it does get to temp but slow, heater core valve= good point.. dont really know, as far as i can tell no kinked hoses that i can see, thanx for you help

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f-150,xlt,ext.cab,2wd,5.4,3.55ls,trailer tow,capt.chairs,6-cd changer,power everything,sliding rear window,
mods.- hand made fresh air tube (k&n style), k&n filter,bug shield,more to come g-a-r-o-n-t-e-e-d

 

Michael54, I have a '99 4.2l and it exhibits similar symptoms as yours. This week it has been between 0 and 10 degrees F in these parts and it takes at least 20 minutes before I get decent heat blowing out of the vents. My feet are always cold and I think the problem is a lousy duct design on the drivers's side. It seems to direct heat to my calfs (is that how you spell it?) and not my feet. The passenger side seems fine. My wife's Taurus has a better heating system after it was recalled! My local dealer told me that there is nothing functionally wrong with the heating/cooling system but that it is a common gripe among F150 owners. The A/C works fantastic in the summer time, far better than the Taurus.
If your thermostat was stuck open, given the weather we experienced this last week or so in the northeast, you engine would NEVER reach operating temperature. Take care.

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99 F150 SC Short Box, 4.2, 5 speed, dark toredor red, light graphite interior, Westin side tubes, A.R.E. hard top tonneau, bug shield, more to add.

 

I have a 2000 f150 5.4 and it too seems to get the heat slowly. I've been plugging in my block heater(its been below zero), and I get heat by the end of my 1/4 mile3 driveway.

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2000f150 Lariat Supercab Flareside 4X4 Black 5.4 engine Leather Captains 3.55 Limited-slip and all the goodies, just ordered,traded my 99 f250 superduty Lariat V-10. Wife drives a 98 Navigator 4X4. Had a 97 Lariat 4x4 supercab Just ordered a lightning front and rear bumper,power tube,K&N filter,makin a 4X4 Harley ......... Toy: 91 Heritage Softtail Classic/lowered and chromed..................[img]//www.f150online.com/fordnews/harley1.jpg[/img]

 

Read this thread. Maybe it will help.
https://www.f150online.com/f150board...ML/000290.html

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97 F-150 SC Lariat, Styleside, White over Gold, 4.6L (Windsor), Automatic, 3.55 rear end, electronic 4X4, w/ every option of Lariat and ORP packages except the 17" wheels (I even got the OR decals now!) Almost completed the Towing Pkg. options, MOD's so far: K&N air box mod, Gibson Super Truck, clear Bugflector II, Leer TSC 600 hard cover, Bridgestone Dueler OWL ATP 265/75 R-16's, TrailMaster Invader N7 shocks, Smittybilt step bars, Ford moulded mud guards, "White-white" head lamps, Cloud Rider Design's SS Grill and bumper opening, Bosch Platinum + 4's, Hayden 30K+ Tranny Cooler, Superchip on the way!

 

thanx everyone i guess l will have to live with it , and yes i tried dialing it back with no effect, thanks all for the help, althou peter you hit it on the head 15-20 minutes later i do have heat and by that time i am almost at work, glad to hear my a/c will work good but a little too cold to use right now unless you are an eskimo.

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f-150,xlt,ext.cab,2wd,5.4,3.55ls,trailer tow,capt.chairs,6-cd changer,power everything,sliding rear window,
mods.- hand made fresh air tube (k&n style), k&n filter,bug shield,more to come g-a-r-o-n-t-e-e-d

 

You Guys do realize that the Engine has to heat up before you get heat in the cab Right?

It's not a big deal to me because I live in southern Louisiana. If I were You I'd go out 15 mins before I was gonna leave and Start the truck with the heater on full blast. I tell you what though, The more important feature of the System Works Great. The A/C is Cold. Even when Its like 100 outside its nice and cool inside within mins.

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98 F150 2WD,Bright Red, Regular Cab, 4.2, 3.55, 5 Speed, Superchip, 2 Superchip Decals (I Think They Add 5 HP Each), 3 Inch Bullseye Lift Spindles, Manik Grill Guard,Nerf Bars, Vent Visors,Air Box Mod, Fog Lights Mounted In Front Air Dam ,2 Kc DayLighters, Back Up Lights, Alpine CD Player, 2 Kenwood Amps, 10 Inch MTX Blue Thunder SubWoofer, Tinted Windows. And Coming Soon: 3 Inch Body Lift Kit, 16.5 x 9.75 American Racing Baja Wheels Wrapped With 35x12.5x16.5 BFG All Terrains

'00 Toyota Celica GT( Wife's Car )

Pics @ http://www.angelfire.com/la2/ccla/

 

I'm not sure if the F150 uses a similar system from what my T100 had but usually when you have the heat on full right after you start the truck it will run coolant throught the heater core thus slowing the heating process of the entire system, kind of like another radiator. I usually let my truck warm up for 5-10 min. in the winter before I get in and go to work and not run the heating system at all during that time. It to me seems to warm up faster. Try that and see if you get the same results.

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1999 F150 S.Cab 4x4
Northland Edition,5.4
Off road pkg. Fleetside
Black w/grey int.

 

My 2000 also seems to take a while to start blowing heat. I thought it was the Mobil-1 oil I out in it a while back (working too good)...but now I see other people have similar experiences.

My 98 F-150 seemed to kick out heat much quicker when it was cold.

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2000 F-150 XLT, 4x2, 5.4L Supercab, Styleside, Black with silver two-tone, 3.55, class III towing package with heavy duty cooling package, 4 wheel disk ABS, overhead console, sliding rear window, keyless entry, dark graphite interior, in dash CD, Pendaliner bedliner, K&N air filter, rubberized undercoating, cabin filtration system, Bugflector II, 5W-30 Mobil 1, engine build 10/4/99


[This message has been edited by Dustoff (edited 01-28-2000).]

 

I must be lucky mine doesn't take that long to start blowing heat after about 3 minutes its blowing warm air in about 10 the cab is nice and warm

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2000 F150 XLT Reg. cab
4.6 Triton Engine
4x2 3.55 rear end gear
sliding rear window
automatic keyless entry
white styleside short box

 

It takes my truck about 5 minutes to heat up, with the mode switch off. Also don't run your fan on high speed, it cools your heater core down much like you fan behind the radiator.

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stock 98 XL, Reg. cab,4.6, Auto, Tow package, 255/70R16 on styled steel wheels,3.55LS, Black with chrome grille and bumpers! MODS: custom stereo by me, building speaker box was a !@#$%. K&N air filter w/ airbox mod, a complete keyless entry system.

 

I recall reading an article a few years back that stated the mod motors and the v6 used a reverse flow water pump that would provide better cooling for the heads. I believe the flow goes to the heads first, then to the block. I've had several vehicles with the mod. motor and all were slow to warm up the interior. My .02

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99 f150 s/c 5.4 sport pkg